IPv6 validation

Question

I used IPAddressUtil.isIPv6LiteralAddress (ipAddress) method to validate IPv6, but this method fails for ipv6-address/prefix-length format (format is mentioned

Answer 1

I had tried below regex in java and it worked for IPV4 and IPV6

public class Utilities {
private static Pattern VALID_IPV4_PATTERN = null;
private static Pattern VALID_IPV6_PATTERN = null;
private static final String ipv4Pattern = "(([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.){3}([01]?\\d\\d?|2[0-4]\\d|25[0-5])";
private static final String ipv6Pattern = "([0-9a-f]{1,4}:){7}([0-9a-f]){1,4}";

static {
try {
  VALID_IPV4_PATTERN = Pattern.compile(ipv4Pattern, Pattern.CASE_INSENSITIVE);
  VALID_IPV6_PATTERN = Pattern.compile(ipv6Pattern, Pattern.CASE_INSENSITIVE);
   } catch (PatternSyntaxException e) {
  //logger.severe("Unable to compile pattern", e);
 }
}

 /**
 * Determine if the given string is a valid IPv4 or IPv6 address.  This method
 * uses pattern matching to see if the given string could be a valid IP address.
 *
 * @param ipAddress A string that is to be examined to verify whether or not
 * it could be a valid IP address.
 * @return true if the string is a value that is a valid IP address,
 *  false otherwise.
 */
 public static boolean isIpAddress(String ipAddress) {

Matcher m1 = Utilities.VALID_IPV4_PATTERN.matcher(ipAddress);
if (m1.matches()) {
  return true;
}
Matcher m2 = Utilities.VALID_IPV6_PATTERN.matcher(ipAddress);
return m2.matches();
  }


}